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I bet all the certificate metadata shown in the „View a certificate“ popup window is vulnerable to cross-site scripting. Back then you probably wouldn’t get a <script> tag through a CA's review process and I found such a problem in Netscape's image „About page“ popup.

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If it were vulnerable to XSS, why would you even want it properly signed by a CA? People almost never inspect the certificates of working websites, the only time they might look at it is when it fails validation.

I actually do like to view certificates of working sites, because it can be interesting to see what's listed in the Subject Alternative Names field. It can lead to some interesting observations about what sites are linked.

Netscape of this era predates the Subject Alternative Name :)

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